NCERT Class 9 Solutions: Triangles (Chapter 7) Exercise 7.1 – Part 4

When two lines are cut by a third line (transversal) co-interior angles are between the pair of lines on the same side of the transversal. If the lines are parallel the co-interior angles are supplementary (add up to 180 degrees).

Q-7 AB is a line segment and P is its mid-point. D and E are points on the same side of AB such that and (see Fig). Show that

Ab Is a Line Segment and P Is Its Mid-Point.

Ab is a line segment and P is its mid-point.D and E are points on the same side of AB such that ∠BAD = ∠ABE and ∠EPA = ∠DPB